Drawing-press.



W. KLOCKE.

' DRAWING PRESS.

APPLICATION FILED AUG.21,1907.

4 SHEETSSHEBT 1.

Patented June 15, 1909.

lvI I HHMHI I HI MNH 11 MM N W. KLOGKE.

DRAWING PRESS.

APPLICATION FILED AUG. 21, 1907 Patented June .15; 1909.

4 SHEETS-SHEET 3. FIG. 4.

INVENTOR fig/270k, 2 /22! L' W. KLOGKE DRAWING PRESS.

APPLICATION FILED AUG.21,1907.

924,672. Patented June 15, 1909.

4 SHEETS-SHEET 4.

WITNESSES: WVM

.*.rnn STATES PAEENT onnrcn.

WILLIAM KLOCKE, OF NEW YORK, N. Y., ASSIGNOR TO E. W. BLISS COMPANY, OF BROOKLYN, NEW YORK, A CORPORATION OF WEST VIRGINIA.

DRAWmG-PRESS.

Specification of Letters Patent.

Patented June 15, 1909.

Application filed August 21, 1907. Serial No. 389,574.

Toall whom it may concern:

Be it known that I, WILLIAM KLooKE, a citizen of the United States, residing in the borough of Brooklyn, county of Kings, city and State of New York, have invented cer tain newand useful Improvements in Drawing-Presses, of which the following is a specificationl This invention aims to rovide an improved press for drawing s eet meta-l into tubular shape, the improvements being especially adapted to presses for doing the largest class of work, drawing out the metal to a length of two feet or more. A long stroke is necessary in these presses, both for the blank holder and for the punch, and the usual ty e of machine employed has these parts of tile apparatus 0 erated by two separate hydrau' lie rams. he proper timing of the movements of the two rams involves a complicated valve system, and there are various other difiicultics arising from the comparative com plexity of the apparatus.

According to this invention 1 use a single ramjwhich is of such stroke and is so connected with the blank holder as to operate the latter to clamp the blank during a preliminary downward movement of the punch, the punch thereupon entering the blank and drawing it to its full depth while the blank holder is merely held inoperative position; while on the return stroke of the plunger, during the first part of the movement, while the punch is being withdrawn from the article, the blank holder is still held in clamping position. After the punch is fully withdrawn the blank holder is opened and the drawn article ejected. This arrangement simplifies very much the construction of the machine, the plunger being preferably connected rigidly to cams which actuate a toggle mechanism for lifting the lower movable member of the blank holder, so that the cams move parallel with and synchronously with the plun er and punch. in fact the only parts whic do not move all together, are the movable member'ofthe blank holder and the toggle mechanism between it and the cams. The accompanying drawings illustrate an embodiment of the invention.

Figure 1 is a front elevation ofthe machine, the work holder and adjacent arts being shown in section. Fig. 2 is a side elevation of the machine. Figs. 3 and 4 are diagrammatic views illustrating different positions of the parts. Figs. 5 and 6 are a dia rammatic elevation and plan of mechanism or controlling the operat1on.

Referring to the embodiment of the inven- "tion illustrated, the work is clamped between the members A and B of the work holder, and is drawn by the downward passage of the punch C, which is connected by a rod D with a cross head E on the lower end of the lunger F of the ram G. In various types 0 ms.- chines the work holder is made with some times one and sometimes the other member movable, and sometimes both members. In the present case we suppose the member A. of the work holder to be fixed (at an adjustable level by screwing up the rods H carrying the cross-bar J which supports the member A and which is guided in the side frames K of the machine). The movable member B is carried upon a slide L moving up and down upon guideways upon the side frames K, and operated by a toggle mechanism consisting of four links M connected at their upper ends to the slide L, and at their lower ends to cranks N on shafts O assing from side to side and through the slde frames K of the machine. The shafts 0 cre provided at their outer ends with cranks P having rollers on their endswhich travel in cam tracks in cam plates Q One of the plates Q is arranged at each side of the machine, and is provided with a ilouble cam track serving to operate two cranks P. Each of the cam plates Q is arranged to slide in a guide R, and 1s fastened rigidly upon the lower end of a rod S, the two rods- S being connected at their upper ends .to opposite ends of the cross-bar E which project through slots in the side framesK.

The cam tracks in the lates Q are formed with two part-s,fa vertica part T and a. hori zontal part U connected -with'each other by a suitable curve. The vertical )art being parallel with the movement of t1eplate,effectsa dwell of the blank holder, while the horizontal part of the track causes the ends of cranks P to swing around and so operates the\ blank holder. If we start with the punch in its raised position (Fig. 4) wefind the ends of the cranks P lying in the horizontal portions U of the cam tracks. During the first part of the downward movement of the plunger and punch, the arm P is swung around until its end lies in the vertical portion of the cam track. The stroke of the plunger is so arranged that during-this move- .tomatically rises by, reason of ment the punch is brought just into the blank. This is the position of the parts in Fig. 3. As the plunger continues to move downward the article is drawn, while the vertical portions of the "cam tracks merely hold the inside crank arms and links up and hold the blank holder in operative position. The completion of the drawing operation is shown in Figs. 1 and 2. Upon the return movement of' the plunger, the first effect is to withdraw the punch substantially completely from the article. It is of great utility to withdraw the punch before opening the blank holder, because of the close adherence of the work to the punch. After the punch is withdrawn there is a continued upward movement of the plunger which brings the horizontal portions U of the cam tracks into play and brings down the lower member of the blank holder. Thisoperation lowers the article upon the fixed ejector V. l

v The simplicity of construction and 'opera' tion effected by the use of a single cylinder, makes it )o'ssible to usea very simple controlling rl'evice, such for example as the mechanism 'ofr'Fig. 5 adapted from planet's. The ,nam G is supplied with continuous lift- ,ing r'essure through the i)e ll, and with operating: pressure through t 10 pipe X which is connected through a valve box Y with either a 'waste pi )e Z or the )ressure pipe a. The valve shaft has a handle a and. a pair of tappets d and e which lie in the vertical planes respectively of strikers f and 9 carried upon any. suitable reci )rocating art of the machine, say for example one of t we rods S. When the plunger moves down it turns the valve shaft 1) so as to connect the pipe X with the waste, whereupon the plunger aut ie pressure through the pipe W until the striker g strikes the 'tappet e and swings the shaft 7) sulli ciently to cut off connection to the waste. The hand lever 0 will then be operated to swing the valve shaft 1) still fartheraround seas to connect the pipe X with the pipe a and repeat the operation.

What I claim is 1. A drawing press including in combina' tion a single ram having a reciprocating plunger, a punch carried by said plunger and reciprocatin therewith a blank holder having a movable member, and means for trans-.

mitting only the first part of the downward movement of said plunger to said movable tion a'ram having a reciprocating plunger, a

punch carried by said plunger and reciprocating-therewith, a blank holder haym a movable member, a cam rigidly connecte to parallel and synchronously" and operated by said plunger so as to move parallel'and synchronously therewith, said.

cam being adapted to actuate said movable member during the first part'of the downward movement of-the punch to hold said member stationary unti the punch is a proximately withdrawn on the return stro e of the plunger.

5. A drawing press including in combination a single ram G havinga plunger F reciprocating in a straight' i stroke, a cross-head E and a unch C carried by said plunger,.a work hol der includin a movable member 'B, toggle mechanism %or operating said member B, and acam operat ing said toggle mechanism and connected rigidly with said cross head.

6. A drawing press-including in combination two movable members, .a hydraulic ram operating one of said members with a move ment which is parallel'and synchronous with that of the ram, and a toggle mechanism for.

transmitting 'to the otherv of said members the action'of the first part only of the movement of the ram.

In witness whereof, I have hereunto si ned my name in the witnesses ILLIAM KLOCKE. Witnesses DoMrNoo A. UsINA, FRED Wm'rn.

ne with a long presence of two subscri ing 10C 

